Question

  explain--- if you don't think about the future , you cannot have one

Answer 1

That phrase means that if you don't think at the future and you continue to stay on the past you cannot see the future which will come.

Answer 2

It means that if you do want to do something in your life,you should think about it,do something about it and don't live in the past,look forward. If you're sitting there waiting for someone else to do your work,you'll never learn how to deal with life.(Înseamnã cã dacã vrei sã faci ceva în viatã,ar trebui sã te gândesti la ea si nu trãi în trecut,priveste înainte. Dacã doar stai si astepti ca altii sã facã totul în locul tãu,nu vei învãta sã te descurci în viatã)